# IBM 3705 Communications Controller

> IBM mainframe communications controller announced in March 1972

**Wikidata**: [Q5968646](https://www.wikidata.org/wiki/Q5968646)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/IBM_3705_Communications_Controller)  
**Source**: https://4ort.xyz/entity/ibm-3705-communications-controller

## Summary
The IBM 3705 Communications Controller is a mainframe communications controller announced by IBM in March 1972. It is part of the IBM 37xx series of mainframe communication controllers, which are essentially small computers that attach to mainframes to handle networking functions on their behalf.

## Key Facts
- Announced in March 1972 by IBM
- Part of the IBM 37xx series of mainframe communication controllers
- Functions as a small computer that attaches to mainframes to handle networking functions
- Manufactured by IBM, an American multinational technology corporation founded in 1911
- Serves as a communications controller for IBM mainframes

### Q: What is the IBM 3705 Communications Controller?
A: The IBM 3705 Communications Controller is a mainframe communications controller announced by IBM in March 1972. It is part of the IBM 37xx series and functions as a small computer that attaches to mainframes to handle networking functions.

### Q: When was the IBM 3705 Communications Controller announced?
A: The IBM 3705 Communications Controller was announced in March 1972.

### Q: What series does the IBM 3705 Communications Controller belong to?
A: The IBM 3705 Communications Controller belongs to the IBM 37xx series of mainframe communication controllers.

## Why It Matters
The IBM 3705 Communications Controller represents an important advancement in mainframe networking technology. As part of the IBM 37xx series, it provided a dedicated solution for handling communications between mainframes and other systems, effectively offloading networking tasks from the mainframe itself. This allowed mainframes to focus on their primary computing functions while the 3705 managed the increasingly complex networking requirements of the time. The device exemplifies IBM's approach to creating specialized hardware components that work together to form comprehensive computing solutions, a strategy that helped establish and maintain IBM's dominance in the mainframe market during the 1970s and beyond.

## Notable For
- Being part of IBM's specialized 37xx series of mainframe communication controllers
- Providing dedicated networking capabilities for IBM mainframes
- Representing IBM's modular approach to mainframe system design
- Being announced in March 1972 as part of IBM's communications controller lineup
- Functioning as a small computer that offloads networking tasks from mainframes

## Body
### Technical Overview
The IBM 3705 Communications Controller is designed to work specifically with IBM mainframe systems. As a communications controller, it serves as an intermediary between the mainframe and various networking connections, handling the protocols and data transfers required for communication.

### Series Context
The 3705 is part of the broader IBM 37xx series, which represents a family of similar communication controllers. These devices share common architectural principles and are designed to work within IBM's ecosystem of mainframe computing products.

### Functional Role
The primary function of the IBM 3705 is to manage networking communications on behalf of the mainframe. This includes handling various communication protocols, managing data transfers, and ensuring reliable connectivity between the mainframe and other systems or networks.

### Historical Significance
Announced in March 1972, the IBM 3705 Communications Controller came at a time when mainframe computing was becoming increasingly networked. The device represents IBM's response to the growing need for specialized networking hardware in enterprise computing environments.